Related Experiment Video
Updated: Feb 18, 2026

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
Published on: July 28, 2022
catena-Poly[[[diaqua-bis(8-hydroxy-quinoline N-oxide-κO)cobalt(II)]-μ-2,5-dimethyl-pyrazine 1,4-dioxide-κO:O]
1School of Chemistry and Chemical Engineering, Shanxi Datong University, Datong 037009, People's Republic of China.
Abstract:
In the title complex, {[Co(C(6)H(8)N(2)O(2))(C(9)H(7)NO(2))(H(2)O)(2)](ClO(4))(2)}(n), the Co(II) ion lies on an inversion centre and is coordinated in a slightly distorted octa-hedral environment. The 2,5-dimethyl-pyrazine 1,4-dioxide ligand, which also lies on an inversion center, acts as a bridging ligand, linking symmetry-related Co(II) ions [Co⋯Co = 8.669 (3) Å] and forming one-dimensional chains along the b axis. In the crystal structure, these chains are linked by inter-molecular aqua-perchlorate O-H⋯O hydrogen bonds, forming two-dimensional layers which are in turn connected into a three-dimensional network via π-π stacking inter-actions between quinoline rings, with a centroid-centroid distance of 3.580 (3) Å. An intermolecular O-H⋯Cl inter-action is also present.
More Related Videos
10:17Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
Published on: February 7, 2019
09:45Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
Published on: April 27, 2017
Related Concept Videos
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Valence Bond Theory
Complexometric Titration: Ligands
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
Coordination Compounds and Nomenclature